Sah::Schema::date::month_name::en - Month name (abbreviated or full, in English)


This document describes version 0.017 of Sah::Schema::date::month_name::en (from Perl distribution Sah-Schemas-Date), released on 2021-08-04.


Sample data and validation results against this schema

 ""  # INVALID (Empty string)

 1  # INVALID (Not month name)

 "jan"  # valid

 "FeB"  # valid

 "March"  # valid

 "foo"  # INVALID (Unknown month name)

 13  # INVALID (Not month name)

Using with Data::Sah

To check data against this schema (requires Data::Sah):

 use Data::Sah qw(gen_validator);
 my $validator = gen_validator("date::month_name::en*");
 say $validator->($data) ? "valid" : "INVALID!";

The above schema returns a boolean value (true if data is valid, false if otherwise). To return an error message string instead (empty string if data is valid, a non-empty error message otherwise):

 my $validator = gen_validator("date::month_name::en", {return_type=>'str_errmsg'});
 my $errmsg = $validator->($data);
 # a sample valid data
 $data = "jan";
 my $errmsg = $validator->($data); # => ""
 # a sample invalid data
 $data = "foo";
 my $errmsg = $validator->($data); # => "Must be one of [\"jan\",\"feb\",\"mar\",\"apr\",\"may\",\"jun\",\"jul\",\"aug\",\"sep\",\"oct\",\"nov\",\"dec\",\"january\",\"february\",\"march\",\"april\",\"june\",\"july\",\"august\",\"september\",\"october\",\"november\",\"december\"]"

Often a schema has coercion rule or default value, so after validation the validated value is different. To return the validated (set-as-default, coerced, prefiltered) value:

 my $validator = gen_validator("date::month_name::en", {return_type=>'str_errmsg+val'});
 my $res = $validator->($data); # [$errmsg, $validated_val]
 # a sample valid data
 $data = "jan";
 my $res = $validator->($data); # => ["","jan"]
 # a sample invalid data
 $data = "foo";
 my $res = $validator->($data); # => ["Must be one of [\"jan\",\"feb\",\"mar\",\"apr\",\"may\",\"jun\",\"jul\",\"aug\",\"sep\",\"oct\",\"nov\",\"dec\",\"january\",\"february\",\"march\",\"april\",\"june\",\"july\",\"august\",\"september\",\"october\",\"november\",\"december\"]","foo"]

Data::Sah can also create validator that returns a hash of detaild error message. Data::Sah can even create validator that targets other language, like JavaScript, from the same schema. Other things Data::Sah can do: show source code for validator, generate a validator code with debug comments and/or log statements, generate human text from schema. See its documentation for more details.

Using with Params::Sah

To validate function parameters against this schema (requires Params::Sah):

 use Params::Sah qw(gen_validator);

 sub myfunc {
     my @args = @_;
     state $validator = gen_validator("date::month_name::en*");

Using with Perinci::CmdLine::Lite

To specify schema in Rinci function metadata and use the metadata with Perinci::CmdLine (Perinci::CmdLine::Lite) to create a CLI:

 # in lib/
 our %SPEC;
 $SPEC{myfunc} = {
     v => 1.1,
     summary => 'Routine to do blah ...',
     args => {
         arg1 => {
             summary => 'The blah blah argument',
             schema => ['date::month_name::en*'],
 sub myfunc {
     my %args = @_;

 # in
 use Perinci::CmdLine::Any;

 # in command-line
 % ./ --help
 myapp - Routine to do blah ...

 % ./ --version

 % ./ --arg1 ...


See also: Sah::Schema::date::month_num.

See also related schemas for other locales, e.g. Sah::Schema::date::month_name::id (Indonesian), Sah::Schema::date::month_name::en_or_id (English/Indonesian), etc.


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Source repository is at


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This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.